<template>
  <div>
    <ul>
      <li v-for="item in arr" :key="item">
        {{item}}
      </li>
    </ul>
    <button @click="doClick">走一走</button>
  </div>
</template>
<script>
export default {
  data() {
    return {
      arr:['帅哥','美女','程序猿']
    }
  },
  methods: {
    doClick(){
     this.arr.push(this.arr[0])
     this.arr.shift()
    }
  },
}
</script>